蒸发模型对乙醇湍流射流火焰模拟影响研究

The high-precision numerical simulation of aero-engine combustor needs a reasonable evaporation model. At present, the quantitative research of evaporation model influence on the two-phase turbulence combustion simulation is insufficient. Ethanol has higher latent heat of evaporation than other fuels and its flame is sensitive to evaporation model. In this paper, LES is used to solve turbulence and TPDF to solve the interaction between turbulence and chemical reaction. The numerical simulation results of Abramzon-Sirignano (A-S) evaporation model, Spalding evaporation model and thick exchange layer (NC-TEL) evaporation model for high-Reynolds number ethanol two-phase turbulent jet flame will be studied and compared with the experimental data. Through quantitative analysis of the different evaporation models’ regularity influence on the temperature, mixture fraction and liquid phase distribution, it was found that A-S evaporation model predictions fitted well with experimental data in the central region of jet flame, but did not perform well in other regions. Spalding model simulation results are good at the x/d =10 section. The simulation results of NC-TEL evaporation model are the best at x/d >10 sections and the regions away from the center of jet flame. Compared with other models, the maximum difference between the NC-TEL model prediction results and the experimental data was 29.7% in liquid phase velocity, so NC-TEL model owns the best performance.